The derivation of trajectories of conduct problems has been reported previously 10. Briefly, latent class growth analysis models fitted in Mplus 20 were applied to six binary indicators of conduct problems derived from the ‘conduct problem’ scale of the Strengths and Difficulties Questionnaire (SDQ 21–22), which was dichotomized at the threshold 4/5 21. The six repeated measures spanned the age period from 47 months to 13 years. The four resulting trajectories were described as low (64.3%), childhood-limited (14.7%), adolescent-onset (11.8%) and early-onset persistent (9.2%).
